[MP2]

I don't know exactly how timers in SA-MP work, but here's a likely theory:

In the server's main 'timer', all timers are looped through to see whether they are needed to be called. This means, if you have a lot of timers, it's looping through a LOT more timers to check whether they need to be called. It's also possible that expired timers are also checked, which means using a timer for every player is likely less efficient.

I think ****** said something regarding this once.